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What Are the Most Common Manufacturing Techniques for Zinc Oxide Varistors?



Zinc oxide varistors are an integral part of modern-day electronics and have become ubiquitous due to their high-performance capabilities and cost-effectiveness. These devices are used to protect circuits from voltage spikes and surges, making them a critical component in electronic devices. One of the reasons for their popularity is the ease in which they can be manufactured using a variety of techniques. In this article, we will explore the most common manufacturing techniques used for zinc oxide varistors and how they impact the properties of the device.


Ceramic processing technique


One of the most common techniques used to manufacture zinc oxide varistor devices is the ceramic processing technique. This process involves the preparation of a ceramic material with the desired properties, followed by compacting it into the desired shape using various methods such as casting, slip-casting or die-pressing. The compacted material is sintered at high temperatures, during which the particles fuse together creating a denser structure.


The ceramic processing technique is preferred because it allows for the production of high-quality, consistent varistors with excellent electrical properties, making it ideal for mass production.


Chemical vapor deposition


Chemical vapor deposition (CVD) is another often-used manufacturing technique for zinc oxide varistors. CVD involves growing a thin film of zinc oxide on a substrate by heating chemicals in the presence of a substrate. The resulting coating is then crystallized through annealing, creating a reliable varistor coating.


CVD coatings are preferred because they allow for the production of uniform coatings with excellent thickness control. This technique is also inexpensive and scalable, making it suitable for high-volume production.


Sol-gel processing technique


The sol-gel processing technique is a wet-chemistry approach used for the synthesis of zinc oxide varistors. This method involves the mixing of solvents, precursor chemicals and surfactants to create a sol that can be shaped or coated onto a substrate. The subsequent drying and calcination process gel the sol into a solid.


Sol-gel coating is preferred due to its relatively low-temperature requirement during deposition, leading to increased compatibility with heat-sensitive substrates. It also provides high flexibility in engineering desired coating morphologies such as the porous varistor layer. As a renowned zinc oxide varistor manufacturer, TGE employs the sol-gel processing technique to achieve precise and efficient deposition of zinc oxide varistor coatings, ensuring compatibility with heat-sensitive substrates and enabling the engineering of desired coating morphologies for optimal performance


In conclusion, the manufacturing techniques used for zinc oxide varistors offer numerous possibilities for producing high-quality, cost-effective components used in modern-day electronics. Ceramic processing, CVD, and sol-gel processing all present advantages depending on the requirements of the end products. Nevertheless, all these techniques are capable of producing reliable, efficient varistors that can protect circuits from voltage surges and spikes. Zinc oxide varistors have already become ubiquitous, and continued innovations in the manufacturing process will undoubtedly improve their performance and lower their environmental impact. TGE leverages the sol-gel processing technique and zinc oxide blocks to precisely deposit varistor coatings, ensuring compatibility with heat-sensitive substrates and allowing for the engineering of desired coating morphologies. This commitment to innovative manufacturing techniques, including the testing of MOV varistors and the evaluation of the MOV core, results in the production of reliable and efficient varistors that effectively protect circuits from voltage surges and spikes.




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